fdupes - finds duplicate files in a given set of directories
fdupes [ options ] DIRECTORY ...
Searches the given path for duplicate files. Such files are found by
comparing file sizes and MD5 signatures, followed by a byte-by-byte
for every directory given follow subdirectories encountered
for each directory given after this option follow subdirectories
encountered within (note the ’:’ at the end of option; see the
Examples section below for further explanation)
follow symlinked directories
normally, when two or more files point to the same disk area
they are treated as non-duplicates; this option will change this
exclude zero-length files from consideration
omit the first file in each set of matches
exclude hidden files from consideration
list each set of matches on a single line
show size of duplicate files
summarize duplicate files information
hide progress indicator
prompt user for files to preserve, deleting all others (see
replace all duplicate files with hardlinks to the first file in
each set of duplicates
when used together with --delete, preserve the first file in
each set of duplicates and delete the others without prompting
provide debugging information
display fdupes version
Unless -1 or --sameline is specified, duplicate files are listed
together in groups, each file displayed on a separate line. The groups
are then separated from each other by blank lines.
When -1 or --sameline is specified, spaces and backslash characters
(\) appearing in a filename are preceded by a backslash character.
fdupes a --recurse: b
will follow subdirectories under b, but not those under a.
fdupes a --recurse b
will follow subdirectories under both a and b.
If fdupes returns with an error message such as fdupes: error invoking
md5sum it means the program has been compiled to use an external
program to calculate MD5 signatures (otherwise, fdupes uses internal
routines for this purpose), and an error has occurred while attempting
to execute it. If this is the case, the specified program should be
properly installed prior to running fdupes.
When using -d or --delete, care should be taken to insure against
accidental data loss.
When used together with options -s or --symlink, a user could
accidentally preserve a symlink while deleting the file it points to.
Furthermore, when specifying a particular directory more than once, all
files within that directory will be listed as their own duplicates,
leading to data loss should a user preserve a file without its
"duplicate" (the file itself!).
Adrian Lopez <firstname.lastname@example.org>